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run code in 150+ php & hhvm versions
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<?php function event($name,$cb = null){ static $e = array(); if ( is_callable($cb) ){ empty( $e[$name] ) ? $e[$name] = array($cb) : $e[$name][] = $cb; } elseif ( false === empty($e[$name]) ) { $a = is_array($cb) ? $cb : array(); foreach ($e[$name] as $eh) call_user_func_array($eh,$a); } } // Add a foo event handler event('foo',function(){ print_r(func_get_args()); }); // Add another foo event handler event('foo',function(){ echo 'Hello, friend!'; }); // Call foo event with parameters event('foo',[1,2]); // Call bar event (does nothing) event('bar');
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 1 [1] => 2 ) Hello, friend!
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/Jo162 on line 24
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/Jo162 on line 13
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/Jo162 on line 13
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Jo162 on line 13
Process exited with code 255.